Drill mechanism



' 1,690,504 T. R. E. RuNDQvlsT DRILL MECHANISM Filed March 13, 1924Patented Nov. 6, 1928.

UNTD

PATENT oFF-ICE.

"unioni: it. nntrnnvisr; or lcuiRinytorri*n,` Y'frA'Mrsfrr'ran,assrGfNojrz. ro sULLivN MACHINERY COMPANY, A CORPORATION orMASSACHUSETTS.

, DRILL MECHNISM.

Application 'led March 13, 1924. 'Serial lo. 699,110.

This invention relates to drill mechanism.

It has for its object to provide an improved drilling mechanism.Afurther object is lto provide a drilling mechanism having improvedfeeding mea-ns therefor. Another object of my invention is to provide a,drilling mechanism having rotation means for a steel and a pneumaticfeed therefor with improved mea-ns for controlling the feed, whichlatter means is dependent upon the `inode of operation of the steel. 1tis another object of my invention to provide improved automatic meansfor reversing the drilling mechanism feed when the opera-tion `off thesteel 'is not complete, such as when the steel becomes stuck.

In the accompanying olrawiirgs 1 have Shown for purposes of illustrationone form which my invention may assume in practice. 1n these drawing`s,Y

Fig. 1 is a side elevation, partly broken away to show details ofconstruction.

Fig. 2 is a diagrammatic viewV of the con* trol means for the feed.

Fig. 3 is a transverse vertical sectional view taken substantially `online 3-'-3 of Fig. 1.

`In the illustrative form of my invention 1 have shown the same embodiedin a drifter type of drill which comprises a combined feed cylinder andshell 1 having usual guideways 2 mounted on the upper side thereof tocarry a drillingmechanism generally indicated at 3 as by gibs 4 slidablymounted in said `guideway's. More specifically, the drilling motorcomprises a usual reci'procable piston 5 having a striking bar Gprojecting forwardly therefrom and into a chuck sleeve 7 rotatablymounted within la chuck housing 8 ycarried on the front end of the motorcylinder 9. Suitable means are provided forrotating the sleeve 7 and tothereby rotate the steel 10, .which means comprises a plurality ofintermeshing rotors 11 carriedin a suitable casing 12 projectingupwardly from the housing 8 and` from which leads a suitable exhaust passage 13 communicating with exhaust ports 14CV formed in the4 housing 8.One of the rotors l1 is adaptedte actua-te a vworin wheel l5 formed onthe periphery of the chuck sleeve 7 as by any suitable worinV not shown)mounted upon, a vertically disposed shaft carrying one of said rotors11. As this part ofthe mechanism per se does notform .part of myinvention it is not thoughtthat further detailed description isnecessary;

Y The feed for the drilling mechanism 3 com- 20 within vwhich is Xedamember 21 as `by a nut construction 22.l Threadedly connected to areduced forward portion A23 of the meinber 21 and projectingl forwardlythrough the rear Ycombined cylinder head and packing gland 24 is ahollow piston rod 25 carrying 'at its forward end a .piston 26 formed ofseveral parts and held together as lbya hollow flanged nut 27 adapted topress said several piston elements against a rear flange 28 to hold thesame in fixed relation; There is also vcarried by the member 2l a fluidconductingl tube 2 9 whichc'ommunicates at its rear `end with a chamber30 and terminates at its forward end in a partition 3.1 carried in theVforward poiationof the bore of the piston rod 25 while communicating asbythe hollow portion of the nut 27 with the front side of the piston 2G.

1n my improved construction l have pro; vided means whereby when theoperation of the steel 10 is not complete or normal, such for instance,as when the same is preventedfrom rotating due to 'any cause, theforward feed will then be reduced or vented lto 'atmos- Tphere andthereverse feed "actuated t'o fre'e the stuck steel or to vallow thecomplete Loper'-V ation bf `the same. This means comprises a springpressed pilot valve 32 ibcip'rocz'rbly mounted within abore 33 formed intherean head 17 Asaid head also supporting the main control valve 34adapted to cooperate with the pilot valve 32. Leading from the maincontrol valve is a live pressure fluid inlet communicating with thecentral rportion of the bore 33 while a second live pressure fluid`passalge 436 likewise lea'ds from the main valve 34 and communicateswith the inlet chamber 37 of the steel rot-ation motor 11. F rom saidchamber 87 a passage 38 leads to the rear end of the bore 33 at whichend valve 32 is normally held for forward feed by "spring 39 seatedagainst a plug 4() closing theo'ppo site `end of the bore 33. Thisspring is so tenL sioned that the valve will 'onlly move when the steelis prevented from rotating. 1h the position shown in Fig. 2 live fluidwill flow through the passage 35 aroundfan annular groove 41 forinedbnthe periphery of the valve 32 und out throughA a passgeflQ leading tothe bore of the hollow piston rod so as to rcommunicate adjacent oneedgeof theL annulargroove 45 formed in the periphery of the valve 32.Vr)There is also, an exhaust port 4G longitudinally disposed from thepassage '44 and communicating 'at the other edge of the annular'. groove45 so that fluid flowing rthrough passage 44 atmosphere. l f u .V

lf therotation 'motorll should be stopped forany reason such as by'awsteel sticking and While normal operating pressure. isVmaintained,pressure in chamberpi" and Consel' ,uentlv in thelpassage 38Will build up and thereby'sliift the valve 32 against the tension 'ofthe spring 39 so as to cut off coinn'iunication 'betiveen the inlet portand the for- Wardfeed passage 42 and'to alsov cut oil coinmunicationbetween the exhaust port 4G` and reverse passage 44. During'thisoperation, however, thefinlet passage is'connected to the reversepassage 44 as by annular groove 45 which allows live .pressure i'luid'toflow through tube 29 to the front side of piston 25 to drive the'samerearwardly. During this operation the `rear side of the" pistonis'fenhausted to the atmosphere. asbya-lloiving communicationbetiveenxsaid rear side, as by passage, 42, and an exhaust port 4? whichcommunicates with an annular grooveV 4l when the valve 32 is'in itsshifted position.

It Will thus be seen that I .have provided an improved drillingmechanism having an independent rotation motor supported by kand movableWith a drilling mechanism and including an improved automatic valvecontrol for the forward and reverse`feed,.such that upon the steelsticking the vreverse feed will be thrown in to release the same.`

lVhile I'have in this application specilically described one form whichmy invention may assume in practice, it Will be understood that thisform o f the same is shown for purposes of illustration and that theinvention may be kmodiiied and embodied in various other formswithoutdeparting from its spirit or the scope of the appeuded'elaims.

7hat I claim as neivand desire to secure by Letters yPatent is: *i

. 14A drill mechanism comprising a `drillingmotor, a steel actuatedthereby, a for- `ward and.reverse positive feeding A,means thereforcomprising but asingle vreversible pressure fluid' actuated. motor, anindependent `pressure fluid actuated rotation motor for said steel, andpressure fluid operated meansresponsive to the resistance to steelrotationfor reversing said feeding means.

2. AA drill mechanism comprising` a. drillingmotor, a steel actuatedthereby, a fluid may be exhausted tothe kversing said feeding` motor.

pressure actuated forward and reverse positive feeding' vmeans thereforcomprising but a single reversible motor, an ,independentrof tationmotor for said steel, and means responsive to the resistanceto steelrotation for affecting the flow of fluid relative to the forward andreverse feed simultaneously.

3. A drill mechanism comprising` a drilling motor, avs'tee'l actuatedthereby, a for- `Ward and reverse positive feeding means rotation -motorfor automatically "affecting both of saidfeeds. -5 i 5. A drillmechanism comprising a drilling motor,v a. steel actuated thereby, "aforward andieverseA positive feeding means` therefor comprising' but asingle reversible motor, an independent rotation motor `for said steel,and rmeans controlledl'byjsaid'rotation motor forautomaticallyreversingsaid feed.` i, f f *1 ,t f

6. A drill mechanism comprising fa ldrilling motor, at steellactuated'thereby, afor- Ward and yreverse positivefeeding meanstherefor, aniiiidependent rotation -motor for saidsteel, `and afluidactuated valve controlled byfsaid rotation motor for automaticallycontrolling-.saidreverse feed.. l .y 7. .A drill mechanism comprising a'drilling motor,- a steel actuated thereby,l a ,for- Wardl and reversepositive feeding means therefoiyan independent-rotation motor `for saidsteel, anda fluid actuated valve con'- trolled by said rotationmotorfor' controlling said reverse-feed, saidvalve being actuated onlywhen said steel is prevented from rotating. i f ,y f' Y 8. rIn adrillingmechanism, vivorl performing means comprising a plurality/'ofmotors one of which `is of the reversible type, While another is rotary,and-means responsive to thetorque of said rotary motorfor automatical-lyreversing said reversibleinotor;

9. A drilling mechanism comprisinga rotary tool rot-ating motor, areversible feed-` ing motor, and means responsiyeto the torque offsaidrotary motorforautomatically relOuA' drilling' mechanism'comprising amotor forhammering adrill steel, ay motor.

for-rotating the steel, a ymotor'for feeding thesteel, one of-saidmotors beingof therev'ersible type, and means responsiveto the torqueofone of said motors for, automatically reversing 'said reversiblemotor,

loo

11. A drilling mechanism comprising a drilling motor, a drill steelactuated thereby, an independent motor for rotating the steel,reversible means for positively feeding the steel in opposite directionscomprising but a single reversible motor, and means responsive to theresistance to rotation for automatically controlling said feeding means.

12. A drilling mechanism comprising a drilling motor, a drill steelactuated thereby, an independent motor for rotating the steel,reversible means for positively feeding the steel in opposite directionscomprising buta single reversible motor, and means responsive to theresistance to rotation for automatically reversing said feeding means.

13. A drilling mechanism comprising a drilling motor, a drill steelactuated thereby, an independent pressure iuid actuated motor forrotating the steel, reversible means for positively feeding the steel inopposite direc tions, and means including a valve responsive to thepressure changes in said rotation motor for automatically reversing saidfeeding means.

14. In a drilling mechanism, lwork per forming means comprising a rotarymotor, feeding means therefor comprising a reversihle motor, and meansresponsive to the torque of said rotary motor for automaticallyreversing said feeding motor.

15. In a drilling mechanism, work performing means comprising apercussive m'otor and a rotary motor, a reversible feeding motortherefor, and means responsive to the load changes on one of said Workperforming motors for automatically reversing said feeding motor.

16. .A drilling mechanism comprising an impact motorfor actuating adrill steel, an independent motor for rotating the steel, reversiblefluid actuated means for positively feeding the steel in oppositedirections comprising relatively reoiprocable cylinder and pistonelements, and pressure fluid operated means responsive to the torque ofthe rotation motor for automatically reversing said feed- 17. In adrilling mechanism, work performing means comprising a rotary motor,reversible means for positively feeding the same forwardly or rearwardlycomprising but a single reversible motor, and means responsive to theload changes on said rotary motorffor simultaneously affecting both ofsaid feeds. Y

18. A drill mechanism comprising a drilling motor, a drill steelactuated thereby, feeding means for said steel for effecting positiveforward and reverse feed thereof comprising but a single reversiblemotor, an independent rotation motor forsaid steel, and means Ie`sponsive tothe resistance to steel rotation for automatically reversingsaid feeding means.

19. vA drill mechanism comprising a Huid actuated drilling motor, adrill steel actuated tliereby,fli1id actuated feeding means for saidsteel for effecting positive forward and reverse feed thereof, anindependent fiuid actuated rotation motor for said steel, and meansresponsive to the pressureohanges in said rotation motor due to thevarying resistance to steel rotation for automatically reversing saidfeeding means.v

In testimony whereof I affix my signature.

THORE R. E. RUNDQVIST.

